The best way to control weeds in the garden is to prevent them from getting started in the first place. Preen Extended Control Garden Weed Preventer has a specialized formula to keep weed seeds from starting. 1-easy application of Preen Extended Control Garden Weed Preventer keeps over 200 broadleaf and grassy weeds from sprouting for up to 6-months. Your garden will stay weed-free all season long. Weeds rob desirable plants of water and other nutrients. Preen Garden Weed Preventer stops weeds and eliminates time-consuming weed pulling chores. With Preen, you will be free to enjoy a beautiful, weed-free landscape. Preen Extended Control Weed Preventer 21.45-lbs. 3500-sq ft Pre-emergent Herbicide | 2464239